Duplex rotary pump



oct. 27,1925. 1,559,323

J. JACKSCN DUPLEX ROTARY PUMP (Filed oct. 9. 1924 v /3 42582/ /f/ 2 4 l1| u u INVENTOR ATTORNEY Patented Oct. 27, 1925.

y A1,559,323 PATENT OFFICE.

.'roHN JACKSON, 'or BROOKLYNNEW. YORKgAssieNon To AiviniarcANY MACHINE&`

FOUNDRY COMPANY, `A CORPORATION or NEW JERSEH f DPLEX ROTA-RY PUMP.

Application andl october a, Y1924.. serial No. 742,526.k

To all whomA t may con-cern.'

Be it known that I, JOHN JACKSON, a sub ject of the King of England,residing atv Brooklyn, county of Kings, and'State of New York, haveinvented a new and useful Improvement in Duplex Rotary Pumps, of whichthe following is a'specilication.

This invention relates to aduplex rotary pump of the high speed typeAad'aptedto be driven by direct connection with an electric motor,4although it may be otherwisesdriven if desired. tion is the productionof a pump 'of this type, in which the 'rotating parts areperfectlybalanced, and lin which wear is reduced to a minimum, both featurescontrib.- uting tohigh eiiiciency. A furtherobject of the inventionisthe-production of a pump of this kind, the rot-ating parts of whichmay be run in either direction. Vith these and other objects notspecifically mentioned in view, the invention consists of, certainconstriictions and combinations which will vbe hereinafter fullydescribed and then speciiically set forth in the claims hereunto'appended. I

`In the Yaccompanying drawings, which form -a part 'of thisspecification and in which like characters of reference indicate thesame or like parts, Fig. l'is a central sectional elevation ofavpumpconstructedv in' accordance with the invention; Fig. 2 isacross-sectional View of the -pumpr shown inv Fig. l; and Fig. 3 isadiagrammaticview showingthe development of the inlet and outlet portsand the rotor of the pumpy shown in Figs. 1 and 2.v I y In carryingthe'invention finto' effect, there is provided a cylinder having inletand outlet ports, means for dividing the'interior of said cylinder intoa plurality of annular chambers, axially movable -means -for segregatingthe ports to prevent leakage from lan inlet port to an outletportor viceversa-Fl atv any point in the operation-of the device, a rotor operativein said chambers lin peripheralcontact with the inner perimeter of thecylinder and lhaving helical V.faces engaging and operating saidsegregating means, and means for operating the rotor. All of the abovementioned rparts and means may be widely varied in construction withinthe lscope of the claims, for the particular` device selected toillustrate the inventionpis but one of many possible concrete embodi-The main object of the invenments Aofthe same. .The invention thereforeis not tobe restricted to the precise detailsl of the structure shownand described.

Referring to the drawings, 4 indicates a cylinder boredin a casting 5andp-rovided with heads 6 and7 bolted to lthe cylinder proper. Each ofthe: heads supports aV bearterior of the cylinder 4 into a plurality ofannular chambers y12,.there being three of these chambers in the pump'illustrated. As shown, this dividing means consists of two annularAmembers 1B stationarily held in the cylinder by means of bolts 14threaded in the cylinder walls and engaging suitable pertures in theperipheries of said inemers.

The cylinder 4 is provided with a series of inletports 1.5 and with aseries of outlet ports 16, these ports beingfcut through the cylinderwall at its bottom.

For the purpose of preventing leakage of pumped fluid from one set ofports to the other at any time, therev is provided axially movable meansfor segregating said ports;

andas shown, this means includes two vanesbetween the inlet port 15 andthe outlet port 16. 'These vanes are so mounted that they may have anaxial sliding movement always in contact with the inner perimeter ofthecylinder, but they have no rotating move! mentt f rllhere isfurtherprovideda rotor which, as shown, is lmade up of parts rotatable in thechambers 12 in peripheral contact with the inner perimeter of thecylinder 4,`and' these parts are collectively in perfect balance. Asshown, the rotor Vis made up of three parts 18,19 and 20, the part 18having oppositely disposed helical faces' 21, and theV parts 19 and 20eachhaving one helical face 21. mounted on the drive shaft 11 beforereferred to, and are keyed thereto by means of va long key 2.2, Spacers23 surround the The rotor parts 18, 19 and 20 are all K shaft 11,between the rotor parts,-and these spacers also are keyed to the shaft11 by means of the long key 22. The parts of the rotor are .heldtogether by means of a series of four bolts 2l, each having a nut 25 ateach of its ends. The helical faces 21 of the rotor parts 18, 19 and 20engage the ends, of the vanes 17, and as the rotor turns, the vanes aremoved axially in the slots of the stationary members 13 to alwayssegregate the inlet and outlet .port-s and force the pumped fluid drawnfrom the inlet ports into the chambers 12 out thi-'ough the outletports. Byan inspection of Fig. 3, it will be seen that the movements 'ofthe vanes are always in opposite directions, so that even these lightparts operate in perfect balance. The middle part 18 of the rotor servesto divide the middle chamber 12 into two parts, so that although thedividing members 13 divide the cylinder into three chambers, there arereally four chambers because the middle one is divided into two parts bythe middle part of the rotor, and as a result oi this construction, theend-thrust in both directions is perfect balance and no undue wear 'ofthe stationary and movable parts will occur.

Means are provided for drainingthe cylinder of any tliuid which mayleal: past the rotor, and as shown, the drainage is into one ot theinlet ports-15 and is ellected by means of a main pipe 26 connecting oneend of the cylinder with one of the inlet ports 15, and by a branch pipe27 connecting the opposite end ofthe cylinder with. the pipe 26. Thispipe arrangement is reversible so that it the pump is to be loperated inthe opposite direction, the inlet ports 151y would become outlet ports;4the outlet ports 136. would become inlet ports; and the pipe 26 wouldbe connected with one of the ports now numbered 16, which would then bean inlet port.

' Each of the inlet and outlet ports is so located that one off therotor parts completely closes it when its periphery at its widest partpasses over it. Thus, in Fig. 3, the inlet and outlet ports controlledby the `rotor parts 19 and 2O are both closed; while the inlet ports 15and outlet ports 1G con-- trolled by the rotor part 18 are both open; sothat when thefparts are-in. theposilion shownin this. ligure, thechamber in which the :rotor parts 19;` and 2O move are completely outoltoperation, lolut the cha-nibe-rs controlled by the rotor part y18 are infull operation. .lt will be understood that as the rotor turns fromthe'4 position shown in Fig. 3 and the middle ports begin toY close, theouter ports will begin to open.l Ars; a result of this construction,there is always a substantially constant `open port area andconsequently a substantially ,constant now ot' fluid tliroughthe pump.

remises What is claimed is :v

1. A pump comprising` a cylinder having inlet and ont-let ports, meansfor dividing the interior of said cylinder into. a .plurality of annularchambers, axially movable means for s egregating said ports, a rotoroperative 1n said chambers in peripheral contact with the innerperimeter of said cylinder and having helical faces operating said,segregating means and made up o1 a member for each chamber, spacersseparating said members, and through bolts holding said mem-bers andspacers together', and means for operating said rotor.

2. A pump comprising a cylinder having inlet and outlet ports, means fordividing the interior of said cylinder into a plurality of annularchambers, ari-'ally movable means for segregatingsaid ports, a rotorVoperative in said chambers in peripheral contact with the innerperimeter of said cylinder and having helical faces operating saidsegregating means and made up of member' for each chamber, spacersseparating said members, and through bolts` holding said members andspacers together, and means for operating said rotor, said dividingmeans including a plurality of stationary annular members having slotsin their perimeters for positioning said segregating means.

3. A pump comprising a cylinder having inlet and outlet ports, means fordividing the interior of said cylinder into a plurality ot annularchambers, axially movable means for segregating said ports, a rotoroperative in said chambers in peripheral contact with theinnerperimeter' orf said cylinder and; having helical 'faces operatingsaid' segregating means and made up a member Vfor each chamber. spacersseparating said members, and through bolts holding said members andspacers together, and means for operating said rotor, said dividingmeans including a plurality ot annularmembers bolted to'said cylinderand having slots in their perimeters for positioning said segregatingmeans.A Y

l. il. pump comprising a cylinder having inleteand outlet ports, meansJfor dividing theV interior ot said cylinder into a plurality ofannu-lar chambers, axialli' movable me'an-s Jfor segregating said ports,a roto-r operative in said chan-mers in peripheral Contact with theinner perimeter ol' said cylinder and having helical faces. operatingsaid segregating means `and n'iade up ci a member for each chamber,spacers ,separating said members, and through bolts holding said membersand spacers together, and means for operating said rotor, saidsegregating means including vanes axially sl-idable on the innerperimeter ot said cylinder between said ports.

5i, ,A ,pump comprising a cylinder having inlet and outlet ports,.meansfor dividing the interior of said cylinder into a plurality of annularchambers, axially movable means for segregating said ports, a rotoroperative in said chambers in peripheral contact with the inner'perimeter of said cylinder and having'- helical faces operating saidsegregating means and made up of a member for each chamber, spacersseparating said members, and through bolts'holding said members andspacers together, and means for operating said rotor, said segregatingmeans including vanes positioned by said dividing` means and slidabletherein in contact with the inner perimeter of said cylinder and betweensaid ports.

6. A pump comprising a cylinder having inlet and outlet ports, means fordividing the interior of said cylinder into a plurality of annularchambers, axially movable means for segregating said ports, a rotoroperative in said chambers in peripheral contact with the innerperimeter of said cylinder and having helical faces operating saidsegregating means and made up of a member for each chamber, spacersseparating said members, and through bolts holding said members andspacers together, and means for operating said rotor, said rotor beingkeyed to a shaft forming a part of said operating means.

7. A pump comprising a cylinder having inlet and outlet ports, means fordividing the interior of said cylinder into a plurality of annularchambers, axially movable means for segregating said ports, a rotoroperative in said chambers in peripheral contact with the innerperimeter of said cylinder and having helical faces operating saidsegregating means and made up of a member for each chamber, spacersseparating said members, andthrough bolts holding said members andspacers together, and means for operating said rotor, and means fordraining said cylinder of fluid leaking past said rotor.

8. A pump comprising a cylinder having inlet and outlet ports, means fordividing the interior of said cylinder into a plurality of annularchambers, axially movable means for segregating sai'd ports, a rotoroperative in said chambers in peripheral contact with the innerperimeter of said cylinder and having helical faces operating saidsegregating means and made up of a member for each chamber, spacersseparating said members, and through bolts holding said members andspacers together, means for operating said rotor, and means for draininginto said inlet port any fluid leaking past said rotor.

9. A pump comprising a cylinder having inlet and outlet ports, means fordividing the interior of said cylinder into a plurality of annularchambers, axially movable means for segregating said ports, a

rotor operative in said chambers in peripheral contact with the innerperimeter of said cylinder and having helical faces operating saidsegregating means and made up of a member for each chamber, spacersseparating said members, and through bolts holdingsaid members andspacers together, and means for operating said rotor, and pipes fordraining into said inlet port any fluid leaking pastsaid rotor.

10. A pump comprising a cylinder having inlet and outlet ports, meansfor dividing the interior of said cylinder into a plu-` rality ofannular chambers, axially movable means for segregating said ports, arotor operative in said chambers in peripheral contact with the innerperimeter of said cylinder and having helical faces operating saidsegregating means and made up of a member for each chamber, spacersseparating said members, and throughbolts holding said members andspacers together, andr means for operating said rotor, said inlet andoutlet ports being so located that the rotor completely closes them whenits periphery at its widest part passes over them.

11. A pump comprising a cylinder having inlet and outlet ports, meansfor dividing the interior of said cylinder into a plurality of annularchambers, axially movable means for segregating said ports, a rotoroperative in said chambers in peripheral contact with the innerperimeter of said cylinder and having helical faces operating saidsegregating means andmade up of a member for each chamber, spacersseparating said members, and through bolts holding said members andspacers together, and means for operating said rotor, said cylinderbeing provided with a set of four inlet ports and a set of four outletports, and said rotor being so mounted that two inlet ports and twooutlet ports are completely closed when the other two inlet ports andthe other two outlet ports are wide open.

l2. A pump comprising a cylin'derhaving inlet and outlet ports, meansfor dividing the interior of said cylinder into a plurality of annularchambers, axially movable means for segregating said ports1 a rotorvoperative in said chambers in peripheral lcontact with the innerperimeter of said cylindeil and having helical faces operating saidsegregating means and made up of a member for each chamber, spacersseparating said members, and through bolts holding said members andspacers together, and means for operating said rotor, four of saidchambers being provided to balance the rotor and prevent end-thrustthereof in said cylinder.

In testimony whereof, I have signed myname to this specification.

JOHN. JACKSON.

